音频输出放大器的作用是把小功率音频输入信号直接转变成功率足以驱动扬声器的输出信号,并在转变时尽可能保持输入信号原来的波形。在Hi-Fi音响技术的初期,这一任务是由两、三级电子管电路来实现的,其输出级大都采用三极管或五极管的单 The function of the audio output amplifier is to directly convert the low-power audio input signal into a signal of sufficient power to drive the speaker and maintain the original waveform of the input signal as much as possible during the transition. Hi-Fi audio technology in the initial stage, this task is to achieve two or three tube circuit, the output stage mostly use a transistor or a single pentode